Machine tool



p 1936- cs. E. HALLENBECK 2,055,530

MACHINE TOOL Filed July 6, 1931 4 Sheqs-Sheen l amen tor S p 1936- ca. E. HALLENBECK 2,055,530

MACHINE TOOL Filed July 6, 1951 4 Sheecs-Sheet 3 V /j I .4 i 4 ET 1 .5 I I 1 6 g W v #7 7 L Gorqti/iM/mfid/r v gwventoz I I J I I I attorney Sept. 29, 1936. 3 E, HALLENBECK 2,055,530

MACHINE TOOL Filed July 6, 1931 4 Sheets-Sheet 4 Patented Sept. 29, 1936 PATENT OFFICE MACHINE TOOL George E. Hallenbeck, Toledo, Ohio, asslgnor to Baker Brothers, Inc., Toledo, Ohio, a corporation of Ohio Application July 6, 1931, Serial-No. 549,082 2 Claims. -(c1.1z1-4s This invention relates to progressing and retracting a member hydraulically in a controlled cycle.

This invention has utility when incorporated in 6 a machine tool power feed from a liquid power source, with a mechanical control for progress sequence as to speed and duration.

Referring to the drawings:

Fig. 1 is a side elevation, with parts broken 10 away, of an embodiment of the invention in a horizontal boring machine;

Fig. 2 is a longitudinal section, on an enlarged scale, of the inter-line controller;

Fig. 3 is a side view of the cam influencin 1! controller response to the machine operation;

Fig. 4 is a fragmentaryview of features of the drive for the cam;

Fig. 5 is an additional view of features of the drive from the right of Fig. 4; 20 Fig. 6 is a detail view of the disconnector;

Fig. '7 is a fragmentary view showing the control connection between the valve past the cam for the work holder at the position of limit for the feed stroke;

25 Fig. 8 is a diagrammatic view of the mechanism of Fig. '7 exaggerated as to the port opening and showing the parts during the return stroke wherein the holder is being retracted from work position;

80 Fig. 9 is a diagrammatic showing exaggerated as to the port opening and showing the mechanism of Fig. 7 at the limit of the return stroke which is at the start of the feed stroke; and

Fig. 10 is a diagrammatic view of the mecha- 35 nism of Fig. 'I also exaggerated as to the port opening and showing the continuation of the feed stroke from the position shown in Fig. 9.

Machine tool frame I is shown provided with guides 2 for members 3 reciprocable toward and 40 from intermediate work table 4. Motor 5 on the member 3 has gearing 6 for power transmission to holder 1 mounting tool 8 for operating upon work 9.

Motor it thru transmission ll drives pump I2 45 in sump l3. Oil l4, or other hydraulic transmission medium, is withdrawn from the sump I3 by way of line l5. The pump l2 forces such liquid under pressure to flow along in line l6, past relief valve to fitting of first valve part 50 i8 at the inter-line controller. Return lines i9, 20, from this fitting l8 extend to the sump i3. From the fitting I8 lines 2|, extend respectively to the head end and piston rod gland end of cylinder 22 of the piston and cylinder device.

55 In the cylinder 22 is piston 23 having piston rod 24 connected to the member 3 and extending in the direction of the guide 2 to be parallel therewith.

In the fitting I8 is chamber 25 to which the line 6 extends. This chamber 25 is at the region of reduced portion 26 of member or second valve part having piston or slide valve sections 21, 28. Slight movement of the member to the left in Fig. 2 places thepressure chamber 25 in communication with port 29, connected by cross 10 duct 30 with port 3|, from which the line 20' extends to the cylinder 22 to cause the piston 23 to force the piston rod 24 along the cylinder in the direction for shifting the member 3 toward the work table 4. This operation of the incom- 15 pressible medium is permitted, for the opposite end of the cylinder 22 has the line 2| in communication with port 32 in the fitting l8. The valve section 21 has so moved as to open the port '32 into the chamber 33 for the liquid to flow back to the sump l3 by way of the line i9. In 20 the instance of the valve section 21 shifting to open port 34 to the chamber 25, the port 34 is connected by cross duct 35 with the line 2| extending to the gland end of the cylinder 22 thereby to act uponthe piston 23 to cause travel of u the member 3 away from the work table 4. The spill or exhausting from the piston rod end'of the cylinder 22 is by way of the line 20 to port 3| into chamber 36, for the valve section 28 is moved to open port 3|. The chamber 36 is in 30 communication by line 20 with the sump l3.

The slidable valve comprising the reduced intermediate section 26 and the enlargements 21, 28, has rod 31 extending thru the fitting l8 to short link 38 from which there is upwardly ex- 35 tending lever 39 connected by horizontal link 40- to the member 3. Spring 4| holds the floating lever 39 in a normal feed actuation position for the member 3. At a mid position for the slidev valve 26, 21, 28, there is idle or no movement of the member 3. Even if there be seepage at the slide valves, such is distributed both ways and no operation follows therefrom. In practice the unbalancing for operation is brought about by very slight longitudinal movement of the rod 31. That movement which is sufllcient to disturb the equilibrium determines the travel. The influencing means which may be effective for following out in succession a plurality of cycles is herein shown as a uniform speed power device of synchronous or other constant speed type of motor effective as a constant for the period of the cycles. Motor 42 (Fig. 5) has its shaft 43 connected by speed reduction changeable speed 5 gearing N with shaft ll having second speed reduction spur gearing transmission connection 4! .with shaft 01 carrying worm 48 in mesh with worm wheel 40 on shaft 50. These speed reduction gearings are in housing 5| mounted on the side of the frame I opposite from the interline controller in the housing ll. The cover for the housing If is readily removable for access to the gears on the shafts l5, 41, for transposing or substitution as quick slip change means for speed variation. The shaft 50 extends thru the frame I and terminally carries cam 52. The cam 52 is shown as a variable influencing means. Cam

section 52 may coact for a constant or gradual uniform speed control; cam section 54 for-a rapid speed increase or acceleration; cam section 55 for a dwell speed; cam section v58 for 'a different speed, and drop-oil cam section 51 for the re-' versal. The cam section 61 accordingly positions the valve 21, 28, toward the right of chamber 22 (Fig. 2). This brings about travel of the piston 22 for a complete stroke to the right (as shown at the right in Fig. 1). Through the follow-up action herein disclosed, -the floating lever is shifted as a result of such travel to return the valve 21, 28', to neutral position. The rotation of the cam brings about at its section 53 a gradual feed as distinguished from the return travel brought about by the section 51. -It is thus seen that the feeding stroke may start slowly along the section 53 with such speed increased along the section 54 and, say as the tool is entering the work, the cam section I55 effects a dwell of the tool in this working relation. This stage may be followed by a further travel feed at the section 56. There may be occasion to restart the machine at each completion of the cycle, or the work table may so handle the work that step-up occurs for continuity of machine operation in a succession of cycles.

Roller 58 rides on the cam 52 and is mounted on bar 59, reciprocable in guides 60. With hand disk 6| pulled outward to clear stem 62 from the bar 59, it is in order to exert a manual external force in influencing the lever 39 for forward or retraction travel of the member 2 by the hydraulic power. When the disk 6| is manipulated to clear hold-out pin 63 so that the stem 62 again registers in opening 64 in the bar 59, the auto- 0 matic power control is effective. Each axial shifting of the rod 31 is neutralized by the hydraulic connection to the piston and cylinder device causing the responsive travel of the member 3. But

as the cam 52 may rotate at a desired slow speed,

a new condition or a set of definite control conditions in sequence may be brought on before the member 3 halts at the end of its stroke. In fact, in practice, the progress is not halting or step by step, but smooth and definite as predetermined by the influencing means upon the controller.

aosasso It is to be understood there is herein a timed control. The operation is influenced or aifected by the cam I2 for the performance of a cycle of operation in a definite period of time. The position of the valve 21, 28, is in practice just away from closure position at the operations and accordingly it hovers toward the closing position for the bar I! to be effective initially while the influence from the link 40 is to operate the plunger 21 closeto or at neutral position. This action is a differential follow-up for port closure in that at each shifting of the bar 58 there is the resultant influence through the link 40 to act on the plunger 21 in pulling the valves 21, 28, to restrict the port areas as exposed. Accordingly,

the operation of the work holder is effective for the neutral positions while the cam travel is that for valve control. Any opening of the valve 21, 28, is immediately followed by a closing influence from the travel of the member 8 along the guide 2 for relocating the valve through the lever 39. The uniform speed motor 42 is in practice effective to give the cam 52 a constant speed which is herein a definite cycle prescribed in the time program for influencing the member to be reciprocated.

what is claimed and it is desired to secure by Letters Patent is:

1. A machine tool comprising a frame, a tool holder having slide bearing thereon, a piston and cylinder device connected to reciprocate the holder on the frame, valve means for the device, a lever provided with a link connection to the means, an additional link providing a connection between the lever and the holder for the valve means to respond to the reciprocation of the holder, a fulcrum for the lever mounted for movement relatively to the frame, a rotary cam for shifting the fulcrum, a constant speed motor on the frame, and speed reduction transmission therefrom to actuate the cam for modifying the response of the valve means to the holder.

2. A machine tool comprising a frame, a tool holder and a work holder on the frame, one of said holders having slide bearing with the frame, a piston and cylinder device connected to reciprocate said one holder on the frame, valve means for the device, a lever provided with a link 1 connection to the valve means, a fulcrum for the lever mounted for movement relatively to the frame, a rotary cam for shifting the fulcrum, a constant speed motor on the frame providing a timing control, speed reduction transmission from the motor to actuate the cam to provide a timed cycle of shifting for the fulcrum to act on the lever, and an additional link providing a connection between the lever and the one holder. 

